diff --git a/src/database.rs b/src/database.rs
index 51b3bfc..9510f61 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -23,6 +23,6 @@ pub trait Database {
     /// Puts the value to the db by the key
     fn put(&mut self, key: DBKey, value: Value) -> PmtreeResult<()>;
 
-    /// Batc
+    /// Puts the leaves batch to the db
     fn put_batch(&mut self, subtree: HashMap<DBKey, Value>) -> PmtreeResult<()>;
 }
diff --git a/src/lib.rs b/src/lib.rs
index a202a54..ac73371 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -22,6 +22,7 @@ pub type DBKey = [u8; 8];
 /// Denotes values in a database
 pub type Value = Vec<u8>;
 
+/// Denotes pmtree Merkle tree errors
 #[derive(Debug)]
 pub enum TreeErrorKind {
     MerkleTreeIsFull,
@@ -30,6 +31,7 @@ pub enum TreeErrorKind {
     CustomError(String),
 }
 
+/// Denotes pmtree database errors
 #[derive(Debug)]
 pub enum DatabaseErrorKind {
     CannotLoadDatabase,
@@ -37,6 +39,7 @@ pub enum DatabaseErrorKind {
     CustomError(String),
 }
 
+/// Denotes pmtree errors
 #[derive(Debug)]
 pub enum PmtreeErrorKind {
     /// Error in database